Re: [RFC v2 PATCH 0/6] MT8173 IOMMU SUPPORT

From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
To: Daniel Kurtz <djkurtz-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Yingjoe Chen
	<yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
Cc: Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
	"open list:OPEN FIRMWARE AND..."
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"pebolle-IWqWACnzNjzz+pZb47iToQ@public.gmane.org"
	<pebolle-IWqWACnzNjzz+pZb47iToQ@public.gmane.org>,
	Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
	"srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org"
	<srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Catalin Marinas <Catalin.Marinas-5wv7dgnIgG8@public.gmane.org>,
	Will Deacon <Will.Deacon-5wv7dgnIgG8@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Tomasz Figa <tfiga-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	IOMMU DRIVERS
	<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Sasha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
	Matthias Brugger
	<matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"k.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org"
	<k.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	"youhua.li-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org"
	<youhua.li-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Lucas Stach <l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Subject: Re: [RFC v2 PATCH 0/6] MT8173 IOMMU SUPPORT
Date: Mon, 18 May 2015 11:23:05 +0100	[thread overview]
Message-ID: <5559BD89.1060100@arm.com> (raw)
In-Reply-To: <CAGS+omASN0GWiXYFg9kn7grWoKywqUiSwLZdW9BKc+S-Dnp+Cg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On 16/05/15 08:08, Daniel Kurtz wrote:
> On Fri, May 15, 2015 at 5:43 PM, Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org> wrote:
>>    This patch adds support for m4u(Multimedia Memory Management Unit),
>> Currently it only support the m4u with 2 levels of page table on mt8173.
>>
>>    It is based on Robin Murphy's arm64: IOMMU-backed DMA mapping[1].
>
>
> Hi Yong, Robin,

Hi Dan,

> The quoted "arm64 iommu-backed DMA mapping" patch set is from 2015-February.
> That was over 3 months ago.
> What is the status of this work?

Still in progress - I've been hampered a bit by having to rework a whole 
bunch of SMMU driver changes and other in-development stuff in parallel 
so I can do at least try to test as much as I can, not to mention 
various unrelated internal work. It also doesn't help that I also tried 
re-engineering things for v3 in a way that made some of it nicer, but 
turned out not to work so well elsewhere.

> Is that still the most recent version of these patches?
> If so, is there a plan when an update will be posted?
> Or, is there an updated public git repo with a more recent version of
> these patches?

This is now my primary focus again, so I'll get an updated posting out 
by the end of next week at the latest.

> My apologies if these questions have been asked and answered before
> and/or elsewhere.

Not on-list, at any rate, so there's no harm calling it out - helps me 
get my priorities straight ;)

Thanks,
Robin.